Ideal chainring size for 429c

It's not only how strong you are but with the DW suspension the squat/anti squat ratio varies with the size of the chainring so there is a ring where they are balanced. You can feel the difference in your suspension when climbing up a hill if you drop to a smaller ring even if you move to a smaller cog to maintain equal effort.

I'm on the pivot 429c, and I have a 30. It seems perfect, just enough to get up really steep pitches and no problem pedaling home on a flat road. A 32 ring would make some pitches impossible for me, a 28 would be better than a 32.